I agonized over slow(3A limit) charging of my previous charger. Got this with parallel charging board and I'm charging 6 x 2200mA 3S packs in 15 minutes or less. When hooked up to 24V powersupply, I can parallel charge my 6 x 3300mA 6S packs at 30A and have fresh packs in less than 30 minutes. This is making the difference in my learning to fly my helicopters.